Strain clamp



Jan. 30, 1923;

WITNESSES:

jt-ZZM m INVENTOR M/iam 5644:0649.

ATTORNEY T 1,443,595 w. SCHAAKE.

STRAIN CLAMP. FILED JUNE 30, 1921.

Patented Jan. 30, 1923.

UNITED STATES PATENT OFFICE.

WILLIAM SCHAAKE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

STRAIN CLAMP.

Application filed June 30.

To all "whom it may concern: h

Be it known that I, VVILLIAM fionaann, a citizen of the United States,and a resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in StrainClamps, of which the followlng is a specification.

My invention relates to conductor clamps and particularly to suspensionstrain clamps for dead-endin conductors.

One object 0 my invention is to provide a device of the above indicatedcharacter that shall be simple and durable in construction, economicalin manufacture and effective in operation.

Another object of my invention is to provide a suspension strain clampthat shall be easy to manipulate and that shall employ standard machinebolts instead of the special .T-bolts commonly employed.

Heretofore, it has been usual. in suspension strain clamps, to employSpecial bolts of substantially J -shape to clamp a conductor in thechannel of a channeled body member. These bolts are comparativelydiflicult to manipulate and, unless they are removed entirely, they mustbe turned about their axes to move them from position over the channel.This movementrequires a certain clearance distance between them, thusrendering the clamp unnecessarily long. Being of special construction,the J-bolts are also more difiicult to replace .in case of damagethereto or loss thereof.

In practicing my invention, I so substitute a plurality of transverselyslidable clamping dogs or plates for the J-bolts as to permit the use ofstandard machine bolts. The arrangement permits the structure to becompact and neat in appearance, of ready manipulation and very effectivein open ationl Figure 1, of the accompanying drawings, a sideelevational view of suspension strain clamp constructed in accordancewith my lllYGHtlOl], in association with a usual dcad-ending suspensioninsulator tl.1erefor, and

Fig. 2 is a view taken along the line ITII of-Fig. 1.

In general, a dead-ending suspension strain device, embodying a clamp ofmy invention, includes an insulator 1, here shown 1921. Serial No.481,511.

as of the well known cap-and-pin type, comprising a cap 2 having aclevis 3, or other means for attachment to a support (not shown), aninsulating body member 4 and a pin 5. A link 6 is attached, at one end,to the outer end of the pin 5, by a pin 7 and 1s slmilarly attached, atits other end, to a clamp 8 by a pin 9. An arcing member or horn 10 maybe secured to the clamp 8 by a clamping device 11 to direct flash-overarcs away from the insulating body member 4 and to thereby preventdamage thereto.

The clamp 8 is provided with a channeled portion 12 or the reception ofone end 13 of a conductor 14, the main body of which may, as indicatedin Fi 1, extend in a horizontal direction, wit% the end 13 inclineddownwardly in the channel 12. Ends 15 and 16 of the channeled portion 12are flared outwardly, the latter having an under curved portion 17 ofrelatively great radius to prevent an acute or sharp bend in theconductor 14 and the consequent concentration of fracturing tensionforces at the bend.

An elongated shelf or flange 18, at one side of the channel 12, isprovided with a plurality of openings for the reception of standardmachine bolts 19 having nuts 20 thereon, and is also provided, at itsouter edge, with a raised or semi-cylindrical portion 2], as best shownin Fig. 2. The portzon 21 constitutes positioning means fora pluralityof clamping dogs or plates 22 that extend transversely to the channel 12and have portions 23 conforming to the semicylindrical portion 21.

Each clamping dog or plate 22 is of substantially arch or C-shape, withthe portions 23 constituting one end thereof and a portion 24 having agroove of substantially \l'shape constitut ng the other end thereof. anelongated slot 25, in each of the plates 22, extends transversely to theconductor 14 from a position substantially at the center of the V-grooveportion 24 to a position over one of the bolt openings in the flange 18,so that one of the bolts 19 may extend therethrough. The portion 24projects into the channel 12 to engage the conductor 14.

Tn the operative or clamping position, as shown' in the drawing, thebolts 19 are screwed ti htly against the plates 22 to firmly we ge theV-groove portions 24 secured in opei against the ('iOllfiilUCtHl. l -2-and to securely position the portion 2 on the semi-cylindrical portions21.

By releasing the nuts 20, on the bolts 19, the clamping" plates 22- ma vbe released 'lrou'i clamping position on the conductors lot and,

by reason of the slots 25, may be Sl'llfliwil transversely with respectto the channel 12 to permit the Withdrawal of the conductors.

The clan'iping plates 12 thus have simple the spirit and scope thereoil,as set forth in] I claim as my invention:

1.5x conductor clamp comprising two clamping members slidably movablewith respect to each other along a line normal to the conductor toreceive and release the latter and means tor exerting a clamping actionbetween said members along a line at substantially right angles to saidline.

2. A clamp comprising a conductor-receiving member, a clamp member forco-' operation therewith, one of said members having; elongatedbolt-receiving portion, and a bolt extending at substantially rightangles to said portion and supported on the other member, thearrangement of parts permitting the clamp member to be moved aside toreceive or ren'iove a conductor While the bolt remains in mountedposition and permitting the clamp member to be secured in operativeposition by the bolt.

8. fr clamp comprising a conductor-re ceiving member, a clamp mon torfor cooperation therewith, one'of said members having' an elongated slotand a bolt extendinn through said slot and supported on the othermember; the arrangement oi parts perinitting the clamp member to bemoved aside to receive or remove a conductor While the bolt remains inmounted position permitt' fiber to be 'ative po ti by-the bolt,

4;. A strainclamp comprising a conduo torreceivi channel member having aplurality of transverse openings a plurality of clamping plates eachhaving an elongated.

to be moved. aside to receive or remove the liar,

slot extending transversely to said channel and a groovedconductor-clampingportion disposed. over the channel and fastening;-members extending through each of, said siotsand into each of saidtransverse openings. p

In a strain clamp the combination With a conductor-receiving member, oia clamp having an elongated slot and a clamping portion and a boltextending through said slot and supported on said member, thearrangement of parts permitting said clamp to be moved aside to receiveor remove a conductoinwhile the bolt remains in mounted position andpermitting; said clamp to be secured in operative position by said bolt.

6. A clamp comprising a member having a conductor-receiving portion andan opening extending transversely to said portion a clamping memberhaving an elongated slot extending transversely to said portion and aportion for engagement with the conductor and a fastening member in saidopening and extending through said slot, the arran 'e nent of partspermitting said plate conductor Without remov 4 said fastening memberand permitting said clamp to be secured in operative position bysaidfasteninn member. r

7. A clamp comprising a member having a condodot-receiving channel. andan open ing extending transversely to said channel at one side thereof,a second member having a conducater-clamping ,cgjroo'ved port-ionoversaiz'l channel and an elongated slot extending transversely to thechannel to a position over said opening; and fastening member disposedin said opening and said slot to clamp said members against a conductola8. A clamp con'iprising a member having a conductorreceiving: channelandan opening extending; transversely to said channel at one sidetl'iereoit, sale, member also liming a positioning portion. at one sideoi? the channel, a second member l'nrving a condue tor-clamping groovedportion over said channel and an elongated slot extending transverselyto the channel to a position ore d member also a conductor. 7 intestimony who i l. suhsiirrilimfl in name this 225% VJILLI A M Fl UH AAKID.

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. e hereunto (lav 0t June

